It never ceases to amaze me the number of people who walk around with a tablet PC and try to use it as a camera.
I don't care how many megapixels a tablet PC has - it's not a real camera, and people look pretty silly trying to hold up a tablet in order to use it as one. Not to mention the fact that people with tablet PCs are typically blocking everyone else's view.
Please do yourself and the rest of the world a favor - if you need to take a photo, buy a real camera.